A new study suggests kids who bite their nails or suck their thumb may have a lower risk of certain allergies. Brook Silva-Braga reports.
From: http://redirect.viglink.com?u=http%3A%2F%2Fwww.cbsnews.com%2Fvideos%2Fsurprising-health-benefit-of-nail-biting%2F&key=ddaed8f51db7bb1330a6f6de768a69b8
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